Design/Selection; Mounting; Piping - SMC Networks VEX3 Series Operation Manual

VEX3 Series
3 position valve with 3 ports / Precautions (3)
Be sure to read before handling.

Design/Selection

Caution
5. Operation in a low temperature condition
Take appropriate measures to avoid freezing of drainage,
moisture etc. in low temperature.
The minimum operating temperature for this product is 0
6. Operation for air blowing
When using a solenoid valve for air blowing, use an external pilot
type.
Use caution because the pressure drop caused by the air blowing
can have an affect on the internal pilot type valve when the internal
pilot type valves and external pilot type valves are used on the
same manifold.
7. Mounting orientation
Mounting orientation is not specified.
8. Initial lubrication of main valve
Grease has been applied to the main valve as initial lubricant.

Mounting

Warning
1. Operation Manual (this copy)
Install the products and operate them only after reading the
operation manual carefully and understanding its contents. Also,
keep the manual where it can be referred to as necessary.
2. Ensure sufficient space for maintenance
activities.
When installing the products, allow access for maintenance.
3. Tighten threads with the proper tightening torque.
When installing the products, follow the listed torque specifications.
4. If air leakage increases or equipment does not
operate properly, stop operation.
Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be performed
after installation.
5. Painting and coating
Warnings or specifications printed or affixed to the product should
not be erased, removed or covered up.
Please consult with SMC before applying paint to resinous parts,
as this may have an adverse effect due to the solvent in the paint.
Caution
1. Preparation before piping
Before piping is connected, it should be thoroughly blown out with
air (flushing) or washed to remove chips, cutting oil and other
o
C. debris from inside the pipe.
2. Wrapping of pipe tape
When screwing piping or fittings
into ports, ensure that chips from
the pipe
material do not enter the piping.
Also, if pipe tape is used, leave 1
thread ridge exposed at the end of
the threads.
3. After piping
Check the piping to prevent air leakage from the piping between the
valve and the cylinder.
4. Connection of pipings and fittings
When screwing the piping or fitting into the valve, tighten it as
follows.
1) When using SMC fitting, follow the procedures below to tighten it.
●M5
First, tighten by hand, then use a wrench appropriate for the
hexagon flats of the body to tighten an additional 1/6 to 1/4 turn.
A reference value for the tightening torque is 1 to 1.5 N·m.
Note) Excessive tightening may damage the thread portion or
deform the gasket and cause air leakage.
Insufficient tightening may loosen the threads, or cause
air leakage.
●When using a fitting other than SMC fitting, follow the
instructions given by relevant fitting manufacturer.
2) For the fitting with sealant R or NPT, first, tighten it by hand,
then use a wrench appropriate for the hexagon flats of the body
to tighten it a further two or three turns. For a tightening torque
guide, refer to the table below.
Connection thread size (R, NPT)
3) If the fitting is tightened with excessive torque, a large amount of
sealant will seep out. Remove the excess sealant.
4) Insufficient tightening may cause seal failure, or loosen the
threads.
5. Piping to products
When piping to a product, refer to its instruction manual to avoid
connection of the air lines to the incorrect ports.
- 6 -

Piping

threads or sealing
Proper tightening torque (N·m)
1/8
1/4
3/8
1/2
3/4
1
1
1 /
4
1
1 /
2
2
3～5
8～12
15～20
20～25
28～30
36～38
40～42
48～50
48～50
VEX-OMT0003